Brake shoe



Oct. 16, 1923.

w. o. LOTT BRAKE SHOE Filed Sept. 12, 1921 V Zv /1 7. 1

Patented st. 16, 1 923.

WILLIAra o. LOTT, or conuranusq onto.

BRAKE SHOE.

Application filed September '12, 1921. 7 Serial No. 499,944.

To all whom'it may concern:-

Be it known "that VVVILLIAM Lorr, a citizen of the United ZStates, residing at Columbus, in the county of Franklin andv State of Ohio, has invented certain new and useful Improvements in Brake Shoes, of

which the following is a specification.

This invention relates particularly to improvements in the construction of brake.

shoes, particularly those of the type designed for user-upon railway rolling-,stoclni an object of the invention being. to produce a'brake-shoe wherein renewable and replace able Wheel engagmg sect ons are provlded,

wl1ich, when worn, are capable of being in-, dividually replac'ed'in order that there will, be a minimum amount ofwastage when the wearing surfaces of'said: sections are worn placement. r r 1..

Ordinarily, it is a common practice in the construction of'brake-shoes with wheel en-,

gaging sections of integral ar'cuate formation, preferably formedfrom cast iron and reinforced by means of a steel backing. These sections are of one piece construction throughout the height of a brakeshoe,'and

consequently when worn or, in any way a damaged, so as to be rendered unfit for serv I ice, the same must be replaced in their n:

tirety. By this construction considerablewastage is presentin the form of scrap, and the present invention aims particularly to provide a brake-shoe wherein the wheel engaging portions thereof include a plurality of similar interchangeable sections, which are connected with the body of the shoe in such manner that the sections maybe either collectively or selectively replaced uponthe body of the shoe so that breakage and wear thereof may be overcome by the employment; of one or more of such sections, 1n-

stead of requiring the replacement of the entire wheel engaging surfaces of a brake shoe, as ls now customary.

A further object ofthe invention resides in a construction whereby the replaceable wheel engaging sections of the brake-shoe may be quickly ,1 and positively connected with the body of the brake-shoe and to this end the heador bo'dy'of the brake-shoe has detachably connected therewith by means of awedge pin construction, a retaining strip with which 1s connected a plurality of replaceablewheel engaging sections, the said sections having their inner faces provided:

away -:to such an" extent. as to require re' with substantially dovetail grooveswhich are adapted to beremovablyplacedupon the retaining strip, removable" members pro yided at the'ends of said strips for retainmg the wear blocks or sect1ons agamsti accidental" displacement thereon, the construc- 7 tion being such 7 that. when the blocks or SeCtlOIIS' ZLI'e carried by the strips and the latter directly secured to the :head of the brake-shoe by the wedge. pin construction,

the entire assemblywill be rigidly'united in a manner free from relative movementand capable ofbeing; employed with the sa'rne efliciency as the standard one piece'construc tio'n now in common usage.

Forfa further understanding of their); v'ention, reference is to be had to'the following description. and to the accompanymg drawings, in Which: Y

Figure I is a view in side elevation of' the improved brake-shoe construction-employed in "carrying out the present invention;

Figure 2 is avertical sectional view taken Figure 3 is a horizontal sectional view through the shoe in its entirety. H

takenon the line. 3..V3 of Figure 1. r

Figure 4: is a vdetail perspective view of one of the wearing blocksor sections.

.F1gure 51s a perspectlve' view of the retaming str1p,--and F'gure- 6 1s a similar view the brake;

Referring more particularly to the details" of the invention, use is made of a brakeshoe 1 whichis formed to include ahead or body 2 of standard construction and with which is associated a removable and replaceable Wheel engaging assembly 8, whichv c'om. prises the present invention. The body'or head-'2is formed to include the usual rear-i wardly extending spaced flanges ,4, which are suitably apertured as at 5 for-pivotal as's'ociationwith the usualbrake beam construction 'for' a freight. or passenger car.

fThe forward face 6 ofthe head 2 is gen Bit transversely extending webs 12 having openings 13 formed thereinfor arcuate registration with the slots 9. It will be observed that the slots 9 and the openings 18 vary in width, in order that the same will be adapted to receive the usual standard curvilineal wedge pin 14, employed in uniting the assembly 3 with the body 2. V

The assembly 3 includes a base in the nature of a metallic retaining strip 15. lhis strip is adapted to conform with the arcuate formation of the outer part of the body 2 and is preferably formed from steel plate material, the ends thereof being inwardly or. rearwardly turned as at 16 to produce shoulders. These strips are adapted to receive a plurality of cast iron wearing blocks or sections 17, which are of duplicate formation and may be employed at any position on the outer face of the retaining strip.

These blocks are secured to the'retaining strip by having their rear faces provided with substantially dovetail grooves 18, which receive the strip 15, the said strip in cross section corresponding to the formation of the grooves 18, which is accomplished by beveling the outer edgesof the strip as indicated by the numeral 19. It will be observed that the strip 15 is of substantially the same width throughout its length, and.

this construction admits of the placing of the block 17 thereon by inserting the blocks upon the strip from the ends of the latter. The operative positions of the blocks upon the strip may then be maintained by the provision of L shaped angle members 20, which have their shorter legs 21 inserted through openings 22 provided in the ends of the strip 15 in order that the legs 21 will engage with the end blocks 17 so as to prevent displacement on the part of said blocks. The longer legs 23 of the angle members are situated on the rear faces of the strip 15 and extend parallel therewith. Accidental removal of the angle members is preventable by inserting cotters 241- through openings provided in the shoulder projections 16.

Th strip 15 and the block 17 positioned thereon are now capable of being directly secured to the arcuate forward, face 6 of the body 2: This may be accomplished by providing the strip 15 with an inwardly directed stirrup 25, which is adapted to be positioned within the socket 10 of the body,

and to be confined between the adjoining faces of the lugs 8. The stirrup is formed with registering openings 26 which are adapted to align with the slots 9 provided in the lugs 8. By this construction, it will be apparent that when the wedge pin 1a is driven into place, the same will pass through the openings 13 formed in the extremities of said body, the slots 9 provided in the lugs 8 and the openings 26 formed in the stirrup 25. By reason of thewedge shaped formation of the said pin, its connection in the manner described with the body 2 will result in drawing the assembly 3 toward the face 6 ofthe body with sufficient frictional pressure to produce a very rigid assembled construction, wherein weakness or relative movement in and between the parts of the shoe will be eliminated. If one or more of the blocks should become worn or broken, the damaged member can be readily re placed by removing the assembly 3 from th body 2. This permits the intact blocks remain within the assembly and the dai aged member conveniently removed, repaired or substituted. Thus, breakage or wear may be locally overcome, a feature which eliminates to a very great extent wastage now commonly prevalent in brakeshoe construction. Again, it will be observed that the blocksare of identical formation and thereforeymay be situated at any desired position within the assembly. It will also be understood that by slight changes in the lay of the block 17, the latter maybe adapted to the driving wheels of a locomotive, or that other'equivalent devices may be employed in lieu of the members 20 for retaining the blocks in their applied positions to prevent creeping thereof on the strip 15. In view of these conditions, it is intended that such changes may be made in the construction of the shoe without departing from the spirit of the invention as defined by the following claims.

What is claimed is:

1. In a brake-shoe, a body, a retaining strip conforming to the contour of the outer part of said body, means serving to removably connect said strip with said body, a plurality of selectively removable wear blocks carried by said body, and removable means carried by the ends of said strip and overlapping the ends of said blocks for retaining said blocks in a relatively fixed position of operation uponsaid strip.

2. in a brake-shoe, a body provided with an arcuate outer face having a socket formed intermediately thereof, a retaining stria shaped to conform with the outer face of said body, and having openings in its ends,

ings formed in said body andprojection for drawing said strip and blocks toward and retaining the same in engagement with the outer face of said body and angle members removably associated with said openings for retaining the blocks in fixed position on said strip.

8. In a brake-shoe, a body formed to include an arcuate outer face having a socket lilO ice

formed intermediately thereof, an arcuate metallic strip conforming and positioned adjacent to the outer face of said body, removable Wear blocks of duplicate formation positioned upon said strip, shoulders pro- 7 vided at the ends of said strip, members in engagement with said shoulders for retaining said blocks against circumferential displacement upon said strip a projection 10 formed with said strip intermediately of its length and arranged to be positioned Within said socket, and an arcuate tapering edge pin arranged to pass through registering openings formed in said body and projection for frictionally uniting the said blocks with said body. I v

In testimony whereof I affix my signature. 7

WILLIAM o. LOTT. 

